It's shorthand for above sea level. A term generally used to define how the top on Earth is to a certain position.
00:46, 15 January 2013
Rear edge of aerofoil or streamlined strut.
Hong Kong International Airport is the main airport in Hong ...
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Pan American World Airways, commonly known as Pan Am, was ...
The Boeing Everett Factory, in Everett, Washington, is an ...
The Michoud Assembly Facility (MAF) is an 832-acre ...
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